-al a-a a-b a-c aaa aab aac aad aal aan aau ab- aba abb abc abd abl abn abu ac- aca acb acc acd acl acn acu ad- ada adb adc add adl adn adu al- ala alb alc ald all aln alu an- ana anb anc and anl ann anu au- aua aub auc aud aul aun b-u baa bab bac bad bal ban bau bba bbb bbc bbd bbl bbn bbu bca bcb bcc bcd bcl bcn bcu bda bdb bdc bdd bdl bdu bla blb blc bld bll bln blu bna bnb bnc bnd bnl bnn bnu bua bub buc bud bul bun buu c-- caa cab cac cad cal can cau cba cbb cbc cbd cbl cbn cbu cca ccb ccc ccd ccl ccn ccu cda cdb cdc cdd cdl cdn cdu cl- cla clb clc cld cll cln clu cn- cna cnb cnc cnd cnl cnn cnu cua cub cuc cud cul cun cuu daa dab dac dad dal dan dau dba dbb dbc dbd dbl dbn dbu dca dcb dcc dcd dcl dcn dcu dda ddb ddc ddd ddl ddn ddu dl- dla dlb dlc dld dll dlu dna dnb dnc dnd dnl dnn dua dub duc dud dul dun la- laa lab lac lad lal lan lau lba lbb lbc lbd lbl lbu lca lcb lcc lcd lcl lcn lcu lda ldb ldc ldd ldl ldn ldu lla llb llc lld lll lln llu lna lnb lnc lnd lnl lnn lnu lua lub luc lud lul lun luu naa nab nac nad nal nan nau nba nbb nbc nbd nbl nbn nbu nca ncb ncc ncd ncl ncn ncu nda ndb ndc ndd ndl ndn ndu nla nlb nlc nld nll nln nlu nna nnb nnc nnl nnn nnu nua nub nuc nud nul nun nuu ua- uaa uab uac uad ual uan uau uba ubb ubc ubl ubn ubu uca ucb ucc ucd ucl ucn ucu uda udb udc udd udl udn udu ula ulb ulc uld ull uln ulu un- una unb unc und unl unn unu uua uuc uun uuu